but anyway, back to my question: webcollage may fill the screen with porn by default, but there is a -directory command line option that will do the vidwacker magic on your personal photos instead, and IMHO that would be far more fitting in a family/work environment
but I cannot find the place to make the edit that would add this option to the webcollage command line.
I had edited /home/share/xscreensaver/config/webcollage.xml and inserted a <directory> tag to contain the path to my photos -- a more general solution would just use the photo directory specified in the general gnome-screensaver defaults -- but even after restarting gnome-screensaver it still runs webcollage with only the -root parameter -- it is getting the "-root" from somewhere, but I can't locate where that is.
can I add -directory to the webcollage command line, either globally or per-user?